diff options
Diffstat (limited to 'commands/findmnt.c')
-rw-r--r-- | commands/findmnt.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/commands/findmnt.c b/commands/findmnt.c new file mode 100644 index 0000000000..da8f58835f --- /dev/null +++ b/commands/findmnt.c @@ -0,0 +1,108 @@ +// SPDX-License-Identifier: GPL-2.0-only +// SPDX-FileCopyrightText: © 2022 Ahmad Fatoum, Pengutronix + +#include <common.h> +#include <command.h> +#include <fs.h> +#include <errno.h> +#include <getopt.h> + +static void print_header(bool *header_printed) +{ + if (*header_printed) + return; + printf("%-20s%-25s%-10s%-20s\n", "TARGET", "SOURCE", "FSTYPE", "OPTIONS"); + *header_printed = true; +} + +static void report_findmnt(const struct fs_device *fsdev) +{ + const char *backingstore; + + backingstore = fsdev->backingstore ?: cdev_name(fsdev->cdev) ?: "none"; + + printf("%-20s%-25s%-10s%-20s\n", fsdev->path, backingstore, + fsdev->driver->drv.name, fsdev->options); +} + +static int do_findmnt(int argc, char *argv[]) +{ + bool header_printed = false; + struct fs_device *target = NULL; + char *device = NULL; + int opt, dirfd = AT_FDCWD; + + while ((opt = getopt(argc, argv, "T:")) > 0) { + switch(opt) { + case 'T': + target = get_fsdevice_by_path(dirfd, optarg); + if (!target) + return COMMAND_ERROR; + break; + default: + return COMMAND_ERROR_USAGE; + } + } + + argv += optind; + argc -= optind; + + if ((target && argc > 0) || (!target && argc > 1)) + return COMMAND_ERROR_USAGE; + + if (target) { + print_header(&header_printed); + report_findmnt(target); + return 0; + } + + if (argv[0]) { + device = canonicalize_path(dirfd, argv[0]); + if (!device) + return COMMAND_ERROR; + } + + for_each_fs_device(target) { + if (!device || streq_ptr(target->path, device) || + streq_ptr(target->backingstore, device)) { + print_header(&header_printed); + report_findmnt(target); + } else { + const char *backingstore; + struct cdev *cdev; + + cdev = cdev_by_name(devpath_to_name(device)); + if (!cdev) + continue; + + backingstore = target->backingstore; + backingstore += str_has_prefix(backingstore, "/dev/"); + + if (streq_ptr(backingstore, cdev->name)) { + print_header(&header_printed); + report_findmnt(target); + } + } + } + + free(device); + + return header_printed ? 0 : COMMAND_ERROR; +} + +BAREBOX_CMD_HELP_START(findmnt) +BAREBOX_CMD_HELP_TEXT("findmnt will list all mounted filesystems or search") +BAREBOX_CMD_HELP_TEXT("for a filesystem when given the mountpoint or the") +BAREBOX_CMD_HELP_TEXT("source device as an argument") +BAREBOX_CMD_HELP_TEXT("") +BAREBOX_CMD_HELP_TEXT("Options:") +BAREBOX_CMD_HELP_OPT ("-T", "mount target file path") +BAREBOX_CMD_HELP_END + +BAREBOX_CMD_START(findmnt) + .cmd = do_findmnt, + BAREBOX_CMD_DESC("find a file system") + BAREBOX_CMD_OPTS("[ DEVICE | -T FILE ]") + BAREBOX_CMD_GROUP(CMD_GRP_FILE) + BAREBOX_CMD_HELP(cmd_findmnt_help) +BAREBOX_CMD_END |